Apparatus for molding plastic substances



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' R. H. S. ABBOTT ET AL APPARATUS FOR MOLDING PLASTIC SUBSTANCES FiledJan. 16, 1922' 2 Sheets-Sheet 1 J J I M, /Zm( W 3,-

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G HnnuuN I ALm July 3, 1923.

fra J.

l molding plasticsubstances and has for its in longitudinal section.

Patented July 3, 1923. i

UNITED STATES RICHARD HARTLEY SMITH ABBOTT Ann aA vi'ns y-ENGLAND;

Bacon s close, 0 LONDON: v

APPARATUS Ton Momma PL'AsTic SUBS A CES, y

' Application filed J'anuary 16, '1922. Serial No. 529,736. :i

To all whom it mag 'concern-L 1 v 7 Be it known that we, RICHARD HARTLEYSMITH ABBOTT and JAMES BROOKS CLOSE,

subjects of the King of England, andboth residing at London,'in England,have invented certain new and useful Improvements in Apparatus forMolding. Plastic Substances, of which the following is a specification.v i

The invention relates to. apparatus for object to providexanzapparatuswhich can either be employed to complete simple'mold ing operations orbe utilized to feed plastic materialto'a machine in which this materialis subjected to further shaping operations. According to this inventionthe apparatus comprises a plate, table or conveyer provided withrecesses'or perforations into which the plastic'material is fed from asupply receptacle in the form of a cake or pellet. 1 The-feed mechanismcomprises one or more charging chambers so constructed as first to dipinto the supply receptacle and pick up a charge of plastic materialtherefrom, next to move into register, with a perforation or recess inthe plate and then to discharge or expel'their contents in the form ofa'cake or pellet into the recess against/the base of the latter or, whena perforated plate 'isused, into-the depthof the perforation, againstsome restricted portion of the perforation or against some temporarystopor anvil cooperating with the plate. One form of apparatus inaccordance with this invention adapted to deliver plastic material inthe form of a cake or pellet :into erfo-rations formed in areciprocating plate or table is illustrated by way of example in theaccompanying drawings, in which- Figure 1 is a sectionalside elevation.v V Figure 2-is asection on the 'line22 of Figurel, and l Figure 3 is 'adetail view on an enlarged scale showing one ofthe charging chambers Theapparatus comprises a pair of yoked standards Aprovided with a drivingshaft B 'upon which fixed and loose pulleys B are "keyed 'in theordinary-manner; TheshaftB drives ca'countershaft C above itlandthrough's'uitable train gear wheelsa second countershaft D near. the bedof themachine.

jMounted; between the countershafts on supporting guides E is a plate ortable F slotted to receive interchangeable perforated plates F. Thetable F is intermittently reciprocated in any known manner, "in theparticular example illustrated this move ment being obtained by means oftoothed quadrants Gr mounted on shafts G engaging racks F on the face ofthe table and Geneva stop -or other known mecha'nismjbeing em ployed torock the quadrants in the desired manner. w

Mounted above the table is a pair of fixed vertical guides H'carrying across head H which is reciprocated upon the; guides by means of aconnecting rod C coupled to a crank C formedon; the shaft G. This crosshead carries an interchangeable plunger or plungers H adapted, to,co-operate ith the openings in the perforated, plate Disposed belowthertable is an annular trough'or receptacle J forthe plasticma terial,this troughvbeing constantly supplied w1th plastic material in powderedor; plastic form from a suitable supply hopper which is preferablyagitatedto ensure'a constant supply. If desired the trough may be mounted upon av circular track along-which it is causedto travel inanysuitablemanner. Mounted upon guides A below the table is a reciprocatingsupport K carrying a series of charging'chambers L, the' support f Kwhich is caused to reciprocate in any suitable means but in theexampleillustrated from a mechanism of theGenevastop type,

not onlyrec-iprocating but also turning about its supporting pivot K.towards the end of its reciprocating movement. This turning movement isobtained in the example illustrated by means of a toothed bevel quadrantG on the shaft G of one of the toothed quadrants G engagin on a verticalshaft The; shaft K is provided witha spline and carries a bracket Kwhich is free to slide in an axial direction alongthe shaft K when thesupport'K is reciprocated. The bracket. K which is supportedon the endof the shaft K also formsa bearing for a bevelpinion' K which mesheswith a pinionvK onthe shaft K- so that when the toothed quadrant G-isrocked,fthe "shaftlK and the pinion K are also rocked thus causingthesupport K to rotate. while the support is still under going itsreciprocating movement. A A Each charging chamber comprises a'cylins (ra bevel pinion K supply trough, the trough is provided with, a falsebottom and the capacity of the charg very considerably .without'departing from this invention and that in place of a reciprocating tableany perforated or recessed I plate or conveyer adapted to be rotated ormoved intermittently in a plane at right angles to the path of thereciprocating charging plungers,,may be employed without departing fromthis'invention,

What we claim as our invention and desire to secure by Letters Patentis 1. In apparatus for molding plastic substances, the combination of aplate having recesses or perforations'therein, a receptacle for theplastic substance and a reciproeating member adapted valternately to dipI into the receptacle and to deliver plastic substance therefrom' intothe perforations or recesses in the plate in the form of a cake orpellet. e

2. In apparatus for molding plastic substances the combination of aplate having recesses or perforations therein, a receptacle for thesubstance to be moulded'disposed below said plate and feed mechanismcomprising a pivotally mounted charging cha ns 'ber, means forreciprocating such chamber towards and'away from the receptacle and forrotating the chamber about its pivotsso that the chamber firstdips intothe receptacle and then delivers a measured charge of plastic substancetherefrom into a recess orv perforation in the form of a. cake as setforth. e

8. In apparatus formolding plastic substances the combination of a platehaving recesses or perforations therein, a receptacle for the substanceto be moulded disposed belowfsaid plate, feed mechanism comprising apivotally mounted support, a plurality of charging chambers thereon,means for reciprocating said support and chambers towards and away fromthe 'receptacle, meansfor causing the support to turn about its pivotsso as to dip lIltO the receptacle and deliver. a charge therefrom in'theform of a cake into the recesses or perforations in thei'plate,

and means for varying the capacityfof th char ing chambers as set forth,

at. in apparatus formolding plastic sub- I stances the combinationof-a'plate having perforations therein, a reciprocating shaping diedisposed above and co-operating- I with said plate, a receptacle forplastic 'substance disposed below the plate and incans for deliveringplastic substance fromthe-receptacle' intofthe perforations in the platein the form of a cake as set forth.

5. In apparatus formolding plastic substances the combination ofa platehaving perforations therein, av reciprocatingshaping die disposed aboveand co-operating with deliver measured quantities ofplastic substancetherefrom into the perforations in the form of a'cake, said mechanismalso constithe plate, a receptacle for plastic substance: v v I disposedbelowthe plateandfeed'me'ohanism adapted to, dip into thereceptacle andY tutin'g an anvil againstj'which the cake is a.

further pressed by means of the upper reciprocating die. as set forth.

6. In apparatus for mold stances the combination of a perforated plate,a pair of -dies disposed above and below said plate, means forreciprocating said dies towards one another, means for moving the plateintermittentlyin a path at right angles to that of the dies, 'areceptacle for plastic substance disposed below thef plate and mechanism forfeeding the plas+ tic substance from the receptacle in the form of acake into the perforations prior to the plate being moved between thereciprocating dies as set forth.

7. In apparatus for molding plastic 'sub- J I recesses or perforationstherein, "a recep- 1 stances the combination of aplatehaving 'ngfplastic subtacle for plasti'cisubstance'disposed below said plate, meansfor varying the depth of a the plastic substance contained within: saidreceptacle, and adjustable mechanism for transferring plastic materialfromxthe receptacle to the perforations in the plate in e i the form ofacake as set forth.

In testimony whereof we have signed" our names to thisspecification. I l

RICHARD HARTLEY SMITH ABBOTTQ JAMES BROOKS CLOSE.

